>>718726893
Average just give syou some idea. The only word is that someone wrote in their resume that SH1 sold 2 million then neglects to say how much 2 sold. So I think each game just sold less and less which is why Konami had no faith in the series.
Just a hypothetical to get to the 5.3 million number:
>SH1: 2 million
>Sh2: 1.5 million
>Sh3: 1.3 million
>SH4: 500,000